fix: add optional remark field to inventory profit/loss entry modal

inventory-web/src/views/stock/stocktake/index.vue

@@ -181,6 +181,19 @@
           />
           <p class="unit-text">单位: {{ currentItem.unit || '个' }}</p>
         </div>
+
+        <!-- ★ 新增: 备注输入框 -->
+        <div class="remark-area" style="margin-top: 15px;">
+          <el-form-item label="备注:" label-width="60px">
+            <el-input
+                v-model="inputRemark"
+                placeholder="选填，可填写差异原因说明"
+                type="textarea"
+                :rows="2"
+                clearable
+            />
+          </el-form-item>
+        </div>
       </div>
       <template #footer>
         <div class="dialog-footer">
@@ -451,6 +464,7 @@ const searchKeyword = ref('')
 
 const currentItem = ref<StockItem | null>(null)
 const inputQty = ref<number | undefined>(undefined)
+const inputRemark = ref('')
 const qtyInputRef = ref()
 
 // ★ 新增: 多人协同心跳刷新定时器
@@ -831,8 +845,10 @@ const handleManualConfirm = () => {
   if (!currentItem.value) return
   const val = inputQty.value === undefined ? 0 : inputQty.value
 
-  updateAndSync(currentItem.value, val)
+  updateAndSync(currentItem.value, val, inputRemark.value)
   showQtyDialog.value = false
+  // 重置备注
+  inputRemark.value = ''
   ElMessage.success(`已记录实盘: ${val}`)
 
   // ★★★ 核心修改：确认数量后自动重新打开全屏扫码，实现无缝闭环
@@ -843,14 +859,14 @@ const handleManualConfirm = () => {
   })
 }
 
-const updateAndSync = async (item: StockItem, quantity: number) => {
+const updateAndSync = async (item: StockItem, quantity: number, remark: string = '') => {
   item.scanned = true
   item.qty_actual = quantity
   scannedMap.value.set(item.uuid, quantity)
 
   syncStatus.value = 'syncing'
   try {
-    await api.addDraft({ uuid: item.uuid, quantity: quantity })
+    await api.addDraft({ uuid: item.uuid, quantity: quantity, remark: remark })
     syncStatus.value = 'success'
   } catch (e) {
     syncStatus.value = 'failed'